Optimize estimating JSON string length.

Barenboim · Barenboim · commit a169ebfacbb4 · 2025-06-10T14:00:43.000+08:00
diff --git a/json_parser.c b/json_parser.c
@@ -92,24 +92,22 @@ static int __json_string_length(const char *cursor, size_t *len)
 
 	while (1)
 	{
-		if (__character_map[(unsigned char)*cursor])
+		if (__character_map[(unsigned char)cursor[n]])
 		{
-			cursor++;
 			n++;
 			continue;
 		}
 
-		if (*cursor == '\"')
+		if (cursor[n] == '\"')
 			break;
 
-		if (*cursor != '\\')
+		if (cursor[n] != '\\')
 			return -2;
 
 		cursor++;
-		if (*cursor == '\0')
+		if (cursor[n] == '\0')
 			return -2;
 
-		cursor++;
 		n++;
 	}
 

Original file line number	Diff line number	Diff line change
`@@ -92,24 +92,22 @@ static int __json_string_length(const char cursor, size_t len)`
`92`	`92`
`93`	`93`	`while (1)`
`94`	`94`	`{`
`95`		`- if (__character_map[(unsigned char)*cursor])`
	`95`	`+ if (__character_map[(unsigned char)cursor[n]])`
`96`	`96`	`{`
`97`		`- cursor++;`
`98`	`97`	`n++;`
`99`	`98`	`continue;`
`100`	`99`	`}`
`101`	`100`
`102`		`- if (*cursor == '\"')`
	`101`	`+ if (cursor[n] == '\"')`
`103`	`102`	`break;`
`104`	`103`
`105`		`- if (*cursor != '\\')`
	`104`	`+ if (cursor[n] != '\\')`
`106`	`105`	`return -2;`
`107`	`106`
`108`	`107`	`cursor++;`
`109`		`- if (*cursor == '\0')`
	`108`	`+ if (cursor[n] == '\0')`
`110`	`109`	`return -2;`
`111`	`110`
`112`		`- cursor++;`
`113`	`111`	`n++;`
`114`	`112`	`}`
`115`	`113`